318 

 ^Frihc \'lll. AGROSTIDE^. 



1 . Flowering glume awnless. 



2. Panicles strict ; pericarp free : grain not perma- 

 nently enclosed in the flowering glume and palea.. (45) Spornholus 

 2. Panicles very lax ; pericarp adherent : grain enclosed 



in the flowering glume and palea (48) Aiirnstis 



1. Flowering glume awned. 



2. Flowering glume indurated, much firmer in texture 



than the empty glumes, 3-awned (44) Aristidii 



2. Flowering glume usually hyaline and more delicate 

 than the empty glumes, 1-awned. 



3. Flowering glume awned from the apex or 

 from the cleft ; spikelets articulate on their 

 pedicels. 



4. Spikelets geminate, lanceolate or 

 linear-lanceolate ; first and second 

 glumes 3-nerved ; flowering glume 

 faintly 1 to 3 nerved, awned from 



the apex (46) Gariiotin 



4. Spikelets solitary ; first and setond 

 glumes nerveless ; flowering glume 

 lobed at the apex and bearing a 



long awn in the cleft (47) (lanioticlUt 



3. Flowering glume awned from the back near 

 the base : spikelets inarticulate ; rhachilla 

 produced and penicellate (49) (■(iliimuurostis 



Tril)o IX. AVENEiE. 



1. Spikelets small, 2-flowered ; rhachilla not produced. 



2. Flowering glumes long cillate-fringed on the back 

 or margins ; emtpy glumes broad, many nerved ; 



spikelets awned (50) Eriachne 



2. Flowering glumes naked; spikelets unawned (51) CocUuhnc 



1. Spikelets large, 2 or more flowered, rhachilla produced 



beyond the upper flower-. (52) Arena 



Tiihc X. CHLORIDES. 



1. Spikes or spieiform branches digitate or approximate. 



2. Spikelets 1 -flowered, the upper imperfect flower 



wanting (53) Cynodov 



2. Spikelets two or more flowered, the upper flower 



imperfect, the flowering glume awned (54) Chhrris 



2. Spikelets with three to six perfect flowers. 



3. Spikes with terminal spikelets (55) Elciisiiic 



3. Spikes with the rhachis extending beyond the 



spikelets in a manifest point (56) Dot h/lorlriiium 



1. Spikes or spieiform branches panicled, filiform ; spikelets 



minute, alternate (57) Lei)l(Hhl„a 



'Vnhv. XI. FESTUCEiE. 



1. Spikelets in spieiform Iji'anches of a simple panicle. 



2. Flowering glumes 1 to 3-nerved ; spikelets many 



flowered (c,tn nipUh-hne 



2. Flowering glumes 7 to !)-nerved ; spikelets 1 to sev- 

 eral flowered. 



3. Spikelets 1 -flowered; upper glumes con- ' 



volute, with .setiform tips {(',?.) Loi))i(illirnim 



3. Spikelets more tlian 1 -flowered: fruiting 



glumes with rcflcxcd subniarginal bristles.. (62) Cvntitihcra 



